Originally Posted by tdracer
The primary reason that the pilot is instructed to set the fuel switch to Cutoff before pulling the fire handle is redundancy - when the Fire handle is pulled, it removes power from the fuel switch circuit. If there has been damage to the fire handle wire routing but not the fuel switch wires and you pull the fire handle first, you've lost the ability shutoff the fuel. Fuel switch first maximizes the ability to shutoff the fuel after a major failure.
Thanks much for the explanation!!
Our B-777 Operations Manual, Vol 2, should have included this information.
Maybe it's buried somewhere in there and I missed it.
